2013 Esri International User Conference July 8–12, 2013 | San Diego, California Technical Workshop Lidar – Working with LAS Datasets Raghav Vemula (3D Team) Esri.
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2013 Esri International User Conference July 8–12, 2013 | San Diego, California Technical Workshop Lidar – Working with LAS Datasets Raghav Vemula (3D Team) Esri UC2013 . Technical Workshop . Agenda • Las Dataset Overview • Demo • What's new in ArcGIS 10.2 • Demo • Recommendations • Custom tools (3D Resource Center) • Demo • Future (Post 10.2) • Q&A Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets LAS Dataset - Overview • LAS Dataset - File based data structure Stores references to LAS files on disk Treats a collection of LAS files as one logical dataset Optionally reference break-line data Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets LAS Dataset - Visualization • In 2D (ArcMap) or 3D (ArcScene) • As points - Symbolize using LAS attributes (Class Codes, RGB etc.) Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets LAS Dataset - Visualization • As a surface - • Symbolize & filter (Bare-earth, First-return, etc.) Control the number of points shown Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets LAS Dataset - Editing • Manual editing (data errors, mis-classifications) • Using Geo-processing tools Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets LAS Dataset - Surface definition • Support for break-lines (Surface constraints) Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets GP Tool Summary 3D Analyst Conversion Conversion To Raster Data Management LAS Dataset Data Management Layers and Table Views Tools enhanced to support LAS Dataset Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets LAS Dataset - Analysis • Derive surfaces - • Direct analysis - - • LAS Dataset As Raster LAS Dataset As TIN Interpolate Shape Add Surface Information Line Of Sight Locate Outliers Rasterize on point metrics - LAS Point Statistics As Raster Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets LAS Dataset - Spatial Reference Support • Assign spatial reference (if missing) • Override using a .prj file (if already present) • Project • Clip using an area-of-interest File extent Study Area Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets Clipped file extent Lidar data - Sharing • Mosaic Dataset - - • Manage Lidar data like imagery Add / remove LAS files Add / remove LAS datasets Share the data as Image services - Easy for others to see available Lidar data Easy to download for project work Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets LAS Dataset API for developers • Freedom to work in multiple languages - • Access to lidar data through image services - • Arcobjects exposed in C++, .NET, Java E.g. download and query 3rd party developers can build custom applications - E.g. Automated classification, Feature extraction, Reality augmentation Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets DEMO LAS Dataset Basics Esri UC2013 . Technical Workshop . New in ArcGIS 10.2 - Indexing • LAS auxiliary file (.lasx) • Improves performance of spatial queries • Efficient use of larger files and files over a network • Benefits both visualization and data processing • Index auto-updates after editing operations Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets Index creation Folder Folder LAS Dataset file1.las file1.las Add file2.las ……. Compute Stats file1.lasx file2.las file2.lasx ……. Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets The index (.LASX) file • Container file for stats and index • One-to-one association with LAS file • Located next to LAS file • Reusable Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets New in ArcGIS 10.2 - Rearrange • Rewrite LAS files with optimal point ordering • Physical sort of point records • Results in an optimized index • Benefits data retrieval operations • Custom GP tool will be published • Utility for evaluating need for rearrangement will be available Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets LAS Dataset To Raster - Performance Improvement with Spatial Index Small files < 200MB Large files > 1GB Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets DEMO New in ArcGIS 10.2 Esri UC2013 . Technical Workshop . Data delivery Recommendations • ‘Rearranged’ LAS, including “.lasx” file, provided as deliverable to client • Yields best performance without client needing to do anything • Does not hurt non-Esri clients Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets Usage Recommendations • Classified LAS files organized as ‘tiles’ • 200 MB file size limit • All participating LAS files have the same Spatial Reference (Projected CS) • Data location (preferably on a local disk) Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets Licensing • Standard, 3D, or Spatial Analyst License - - • Create LAS dataset Modify LAS dataset schema Include in Mosaic dataset - Publishing requires Image Server extension View in 2D Rasterize 3D Analyst License - Edit class codes View in 3D TIN based surface analysis Rearrangement Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets 3D Resource Center - Utilities CheckLAS LAS Model Key LAS To LAS Height Above Ground Ground Classifier LAS Dataset Tools Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets DEMO Custom Tools Esri UC2013 . Technical Workshop . Airborne Vs. Terrestrial Lidar • Many tools cater to airborne Lidar data - • Surface views and analysis tools LAS attribute relevance Terrestrial lidar supported as point cloud in ArcScene - Points used as backdrop for measuring and digitizing Display integrated with other GIS layers Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets Las Dataset Vs. Terrains • Geo-database • Z-tolerance pyramiding • Duplication of Lidar data • Editing • 3D Viewing • Las Dataset and Terrains are complimentary Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets Future (Post 10.2) • Enhancements Some custom tools will be provided out of the box - Ground classifier, Model key etc. - Potential new functionality - Tile, Clip, Merge - Break-line extraction - Include Z as part of point filtering - Assign RGB from photo - Fast outlier detection - Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets Future (Post 10.2) • Compression Esri compressed LAS - Lossless - Transparently treated as LAS but much better for use and exploitation - Library for 3rd party use - Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets Why use 3D GIS? Because our world is 3D Improve understanding 3D is easy for everyone to understand Solve 3D problems Some spatial problems can only be solved in 3D Better communication 3D makes it easier to articulate ideas Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets What can you do with ArcGIS 3D? 3D Geodesign Multiscale 3D Models ArcGIS for 3D Cities Surface modeling Share 3D scenes Native lidar support 3D Analysis Integrated 3D Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets Thank you… Please fill out the session evaluation Offering ID: 1334 Online – www.esri.com/ucsessionsurveys Paper – pick up and put in drop box Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets Esri UC2013 . Technical Workshop . Lidar - Working with LAS Datasets